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在灌水的水稻田进行了7个水稻品种(4个日本品种、1个葡萄牙品种、1个中国品种和1个匈牙利品种)的直播试验以明确影响水稻成苗的关键因素。在平均温度17.9～22.7℃的情况下,此7个品种的成苗率为18%～94%,差异达到显著水平。导致低成苗率的主要因素是幼苗的漂浮和死亡。该两因素是相互独立的,其相对重要性亦因品种而异。与其它品种相比,Arroz da Terra品种的幼苗漂浮率相对较低。幼苗漂浮率与株高、种子根长度或幼苗在水中的表观重量无明显相关性,可以认为水稻品种幼苗漂浮率的不同是因幼苗2叶期不同的扎根能力所造成的。
Direct seeding trials of seven rice varieties (four Japanese, one Portuguese, one Chinese and one Hungarian) were conducted in paddy rice fields to specifically identify the key factors that affect rice seedling establishment. Under the average temperature of 17.9 ~ 22.7 ℃, the seedling rate of these seven varieties was 18% ~ 94%, and the difference reached a significant level. The main factors leading to low seedling emergence are seedling floating and death. The two factors are independent of one another and their relative importance also depends on the breed. Compared with other varieties, Arroz da Terra varieties seedling floating rate is relatively low. There was no significant correlation between the seedling floating rate and plant height, seed root length or the apparent weight of seedlings in water. It can be concluded that the difference in seedling floating rate of rice seedlings is caused by different rooting ability in seedling 2-leaf stage.